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Also, where the action is. The key center of activity; where important things are happening. For example, He decided to set up his store here, convinced that this is where it's at, or I'm going into the brokerage business; that's where the action is these days. The action or activity in this phrase can relate to just about anything—financial, political, social, or commercial. [Slang; c. 1960]
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.